A 55-year-old male presents with a cough productive of
large volumes of clear, watery sputum. He has never smoked and has been
always careful to avoid passive inhalation of cigarette smoke. He is an
accountant by profession.
Clinical examination is unremarkable. Chest x-ray shows a
single, irregular shadow in the periphery of his right lung with an air
bronchogram within the tumour opacity.
This is most likely to be:
Small cell carcinoma
Large cell carcinoma
Alveolar cell carcinoma